Automatic stop gear for lift cages



Aug. 26, 1930.

A. SCHANK ET AUTOMATIC STOP GEAR FOR LIFT CAGES Fil ed Sept. 12, 1928 rt 70 0w, w i 4/ fizvzniors:

UNITED is'ra'rss PTENTj-OFFICE Anon ScnAitk'Ann OT'IYQIBITTEL, or mwema, GER ANY i i i I UTOMATIC stroreEAR FOR LIFT o ens i Application filed September 12, 1928, Serial No. 305,557, and in Germany January 13, 1928;

This. invention relates to an automatic stop ways u in a horizontal, vertically slidable gear for lift cages and thelike and consists plate 12 by the displacement of which the in the provision on the cageof a horizontal, triggers can be operated for releasing the vertically movable frame carrying'brake elebrakes p. e v

ments adapted to be positively applied on an The cage is suspended on the cable by upward displacement of the frame relative to means of a frame Z) which embraces the V the cage, and spring-prcssedpilot brakes mechanism just described. The framebears adapted to effect suchdisplacement of the by means of a ,coil spring 12 against a leaf frame in case the cableshould break, said spring w; A plunger w, which is guidedin V p pilot brakes being normally'h'eld man inthe frame and which passes. through the so operative position by elements which are resprings, has a collar z-whichis clamped beleased on the breakage of the cable. 1 tween the two spring elements andwhioh 'Fig. 1 of'the accompanying drawings repnormally'maintai'ns'the head of the plunger 1 resents a vertical section of the device, and at a small distance from the plate 4). If the 15 Fig. 2, a horizontal section. of-the same Spring 00 should be released owing to breaktakenon the line 22 of Fig.1. v ageof the "cable, the plunger will be thrust The lift cage Z) is guided in known manner forward by'the spring y so as to strike on vertical rails a and is'provided with upagainst and depress the plate '0 which then I rights 0 formed with necks, whereon a horioperates the triggers and releases the brakes 20 zontal frame d is adapted to slide. Two pairs 0. The latter act as pilot brakes in that they of brake levers f are mounted within the cause the frame 0? to be raised on the uprights frame on vertical pivots e and fitted with eX- c as the cage descends, and by this raising changeable brake shoes 9 adapted to grip the of;the frame the bell-cranks j Will be turned guide rails a. Springs h arranged between so as to apply the principal brakesg and 25 the lever arms tends to hold the brake shoes stop the cage. v outof engagement with the rails. Between WVe claim: thefree ends of each lever pair, a wedge z'is 1'. In an automatic stop gear for lift cages so arranged that it can be displaced for and the like, the combination with guiderails spreading the arms apart and applying the for the cage, of a frame supported on the 3o brake shoes to the guide rails. The wedges cage and adapted for vertical displacement so I are for this purpose engaged by bell-cranks relative thereto, principal brakes comprising j which are pivoted at 7: to brackets l secured two pairs of double-arm levers mounted in to the underside of the frame d and which said frame and adapted for application to a are connected by links m to the cage 6 so as to said guide rails, wedges arranged to slide in be turned for application of the brakes when the frame and adapted to be interposedbe-- the frame d is upwardly displaced relativeto tween the lever arms for applying the brakes, the cage, Y Y 7 7 bell cranks pivoted to the cage and to-the; In brackets n on top of the framed two" frame and adapted to co-operate with said horizontal, coaxial rods 0 are arranged to wedges for applying the brakes on displace- 40 slide. At the outer ends of the rods brake ment taking place between the cage and the so shoes p are provided which can be applied to frame, pilot brakesmounted in'the frame and the guide rails a by an outward displacement adapted to be applied to the guide rails for of the rods. Coil springs r, arranged on the displacing the frame, springs tending toaprods 0, bear against the rear brackets n and ply said pilot brakes, means for arresting the 5: against collars g on the rods and tend to 'appilot brakes in in-operative position, and 3} ply the brakes p to the guide rails. A pair means connected with the suspension eleof triggers s, which are pivoted attto brackments of-the cage for releasing the pilot Y ets on the frame d,'normal1y engage the colbrakes on'breaka'ge of the 'liftcable. e lars 9 so as to prevent the-brakes p from be- 2. A structure .as claimedin claim 1 where ing applied. The triggers engage in 'guidein the means for arresting the pilot brakes j;

comprise a pair of triggers and wherein the releasing means comprises a spring-pressed plunger adapted to strike agalnst the triggers, and means connected with the suspension elements of the cage for maintaining said plunger normally tensioned and in inoperative position.

ADOLF SCHANK.

OTTO BITTEL. 

